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Manufacturing of Bleaching Powder
Bleaching powder is prepared by passing dry chlorine over freshly prepared cool, dry slakedlime.The greenish yellow vapour of chlorine will form leaving behing yellowish white powder.
Ca(OH)2 + Cl2 -------------------- CaOCl2 +H2 O
CaOCl2 is bleaching powder.
Bleaching powder liberated free chlorine on reaction with dilute acids or when exposed to atmosphere where it reacts with carbon di oxide and moisture evolving chlorine .
CaOCl2 + CO2 + H2 O ----------- CaCO3 +Cl 2
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